From the videographer's Vimeo page:> Volcanic eruption in Vatnajokull. Shot for Helicopter.is - Helicopter Service of Iceland.

Haven't really had time to watch the video. Volcano season keeps me pretty busy. I cut it on board the helicopter on the way back from the eruption. Threw some music from the fantastic composer Veigar Margeirsson (veigar.com) on it and posted it here.
It took us 90 minutes to fly to Grimsvotn with a strong wind against us. The eruption looked magnificent in the sunset. Once we landed 5 miles away from the crater the cold glacier air hit us like a truck. We tried to work outside but I only lasted for a couple of minutes. Pilot Reynir Petursson also didn’t want to stay on the ground for too long since it was very windy and the ash fall was unpredictable. The light was also disappearing and he needs visual reference which is difficult on a white glacier. Once we got off the ground again we had to stay low because there were so many lightnings all around the eruption. Getting hit by a lightning in that strong wind, extreme frost and next to a live volcano was not desirable. We made it back to Reykjavik at 2am. Now the airspace has been closed in a 20 nautical miles radius because of ash.